Alarm with trundle switch

ABSTRACT

The invention relates to a burglar alarm system which may be connectable to portable office equipment of varying types. The invention provides a noise-generating element such as a horn which is connectable to a battery to permit the sounding of the horn when the office equipment is either tilted or lifted. An angular displacement arrangement permits the connection of the battery to the noise-generating element and comprises a cuplike member having an aperture in the center thereof. A solid of revolution is freely movable on the bottom surface of said cuplike member to either prevent or permit the projection of a pin through the aperture, when the office equipment or other portable equipment on which the burglar alarm is installed, is either tilted or moved. The pin prevents the solid of revolution from shutting off the alarm system once the solid of revolution is moved from its normal position over the aperture, so that the alarm sound continues until the alarm is reset by a key mechanism.

[ Feb. 22, 1972 FOREIGN PATENTS 0R APPLICATIONS 748,860 7/1933France...............................200/6l.45

Primary Examiner-David L. Trafton Attorney-Kirschstein, Kirschstein,Ottinger 8: Frank [57] ABSTRACT The invention relates to a burglar alarmsystem which may be connectable to portable office equipment of varyingtypes. The invention provides a noise-generating element such as a hornwhich is connectable to a battery to permit the sounding of the hornwhen the ofi'ice equipment is either tilted or lifted.

United States Patent Dugganetal.

[54] ALARM WITH TRUNDLE SWITCH [72] inventors: Richard E. Duggan,Glastonbury, Conn.;

Bernard L. Sandberg, Kings Point; Manfred Reisner, Woodmere; Allan J.Gascoigne, New York, all of N.Y.

[73] Assignee: Cat Products, Inc., Melville, NY.

[22] Filed: Dec. 30, 1969 [21] Appl. No.: 889,256

An angular displacement arrangement permits the connection of thebattery to the noise-generating element and comprises a cuplike memberhaving an aperture in the center thereof. A solid of revolution isfreely movable on the bottom surface of said cuplike member to eitherprevent or permit the projection of a pin through the aperture, when theoffice equipment or other portable equipment on which the burglar alarmis installed, is either tilted or moved. The pin prevents the solid ofrevolution from shutting off the alarm system once the solid ofrevolution is moved from its normal position over the aperture, so thatthe alarm sound continues until the alarm is reset by a key mechanism.

17 Claims, 12 Drawing Figures immmm xmsxxx 3 535 /31 8 5484 u e numrnl.a z o mzm m 2 4. 4 2@ 3 m M030 6 12 1 NM M M S m m a 2 m u 2 l m 5 mm mm m1 M A u a m i. P "0" m mm w c s mam H In, E ums "m m mm A rmhm m mm mT mmom m m "a k S ainhmo U mm e D LB CLB m mm R m "h m n 43922 n n N52566 N n U 999999 m HAHN L 23673 C G 1 s rm mnowm U mm .359 4691 3 .l.1] l. 9 74W2 2 1s 6 .3 H 5.5. H t 2 2333 Patented Feb. 22, 1972 3Sheets-Sheet 1 46 FIG.8

EINVEINTORS RICHARD DUGGAN L. SANDBERG REISNER BERNARD BY MANFRED ALLANI n J. GASCOIGNE M f ATTORNEYS Patented Feb. 22, 1972 3,544,921

3 Sheets-Sheet W,W,m, 411,1

AT'TO RNEYS Patented Feb. 22, 1972 I 3,644,921

3 Sheets-Sheet 5 F I G .9

\ O O O O FI'GJO INVENTORS. RICHARD E. DUGGAN BERNARD L. SANDBERG BYMANFRED REISNER ALLAN J.GASCOIGNE- ATTORNEYS ALARM WITH TRUNDLE SWITCHBACKGROUND OF THE INVENTION The invention relates to a burglar alarmsystem for portable office equipment and more particularly to an alarmwhich when once activated cannot be deactivated by the mere place mentof the office equipment back in a normal position.

Heretofore, it has been known to provide a burglar alarm for portabletypes of equipment which provides for the continuous ringing of an alarmwhile the equipment is being unauthorizedly removed. Numerous attemptshave been made at providing small compact alarm units which are easilyattachable to office equipment and which will continuously ring duringthe burglarizing of the equipment. However, in most instances heretoforeknown, the systems relied upon solenoidoperated switching arrangementswhich are in the form of relays or other electrically controllableswitches for the necessary continuous ringing of the alarm. Theseelectrically operated switching arrangements did not permit a compactunit and further increased the costs thereof tosuch a degree that inmany instances the costs would be deemed prohibitive.

It had been determined that reliable mechanically operated switchingarrangements such as an angular displacement switch would provide a morestable, less expensive, and more reliable unit which would permitminiaturization to the degree that the burglar alarm unit would notcreate an unsightly piece of equipment but which would afford the sameprotection previously sought.

It is the general object of the present invention to avoid and overcomethe foregoing difficulties found in the prior art devices by providing acompact burglar alarm unit which is both inexpensive to manufacture andwhich is mechanically reliable. I

Another object of the present invention is to provide a burglar alarmunit which is adapted to continuously ring after the alarm has beenactivated.

Another object of the present invention is to provide a burglar alarmsystem which will continuously ring utilizing a angular displacementswitch arrangement.

Still another object of the present invention is to provide a angulardisplacement operated switch arrangement which will not permit thedeactivating of the switch, unless reset by a security device.

Still a further object of the present invention is to provide a burglaralarm system which is provided with its own energy source and which isof a compact nature.

Yet a further object of the present invention is to provide a burglaralarm system which has an internal adjustment to vary the sensitivity ofthe angular displacement switch which is adapted to varyingapplications.

Another object of the present invention is to provide a burglar alarmsystem having a key with which an operator may deactivate the alarmmechanism to permit the servicing or movement of the alarm withouthaving the mechanism emit an alarm signal.

Another object of the present invention is to provide a burglar alarmsystem which is attachable to portable or stationary office equipmentand which will permit the continuous ringing of an alarm system which isattachable to portable or stationary office equipment and which willpermit the continuous ringing of an alarm system during the movement ofthe equipment and which will not create an unsightly appearance.

The aforesaid objects, and other objects which will become apparent asthe description proceeds, are achieved by providing a burglar alarm unithaving a housing, a horn adapted to emit an audible signal, a source ofelectrical energy adapted to be connected to said horn or suitablecompact noise generator, and a angular displacement switchingarrangement for activating the horn when the equipment is attempted tobe burglarized, said switching arrangement further permitting the hornto ring continuously after the same has been activated and therebypreventing the deactivation of the horn by the burglar.

BRIEF DESCRIPTION OF THE DRAWINGS For a better understanding of thepresent invention reference should be had to the accompanying drawingswherein like numerals of reference indicate similar parts throughout therespective views and wherein:

FIG. 1 is a perspective view of a portable office equipment having theburglar alarm connected thereto,

FIG. 2 is a perspective view of the burglar alarm unit,

FIG. 3 is a cross-sectional view of the burglar alarm unit,

FIG. 4 is an under cross-sectional view of the invention,

FIG. 5 is a cross-sectional view of the invention taken along lines 5-5.

FIG. 6 is a partial cross-sectional view showing the operation of thereset key,

FIG. 7 is a partial cutaway view of the invention,

FIG. 8 is a schematic diagram of the invention,

FIG. 8a is a schematic diagram showing the operation of the electricalswitch,

FIG. 8 b is a further schematic view showing the operation of the reset,

FIG. 9 is a partial cutaway front view of an alternative embodiment ofthe alarm mechanism with the switch in the activated position, and

FIG. 10 is a partial cutaway front view of an alternative embodiment ofthe alarm mechanism with the trundle switch in the deactivatedcondition.

DESCRIPTION OF THE PREFERRED EMBODIMENT It should be particularlyunderstood that the principles of the present invention are broadlyapplicable to numerous uses such as alarms for furniture, valuablepapers, traveling purposes and the like, however, the invention shall bedescribed as being particularly applicable to portable office equipmentbut it should not be considered to be limited thereto.

Referring now to FIGS. 1 and 2, a self-contained alarm unit isrepresented generally by the reference numeral 10. The unit is providedwith a boxlike frame 12, with one side open having disposed therein anoise-making element 14, such as a horn, which is adapted tocontinuously create a piercing loud noise when activated by anelectrical source or battery 16.

The alarm unit 10 is so constructed as to give an alarm when theequipment to which the alarm is connected is either tilted off a normalstance position, moved suddenly or jolted. The alarm is of a continuousnature, that is once the horn has been connected to the source ofelectrical energy, and continuously gives off an alarm sound, the alarmwill continuously sound until the horn has been physically disconnectedfrom the electrical source 16 or is reset to its normal ready position.

It should be particularly understood by those skilled in the art thatthe type of alarm is not limited to the mere use of a loud piercingsound but can be adapted to generate sufficient electrical energy toactivate flashing lights of varying colors and may also include theability to transmit a signal to activate alarm systems at remote points.1

In order to provide a mechanical means of activating the horn 14, asshown in FIG. 2, an angular displacement switching arrangement 18 isprovided which has a cuplike element 20 having a concave bottom surface22. The cuplike element 20 is adapted to receive a solid revolution 24such as a steel ball, which is freely movable on the concave surface 22.At the lowest point 26 in the concave surface 22 there is provided anaperture 28 therein over which the ball 24 is adapted to seat when thealarm unit 10 is in its normal or rest position as shown in FIG. 1. Itmay be seen, that if the concave surface 22 is tilted the ball or solidof revolution 24 will move from its normal rest position, over theaperture 28, and seek another position relative to the movement of theconcave surface 22. In so doing, the ball 24 uncovers the aperture 28.As previ ously indicated not only a tilting action will unseat the ball24 from over the aperture 28 but a sudden movement of the concavesurface 22 will also provide the necessary impetus to move the ball 24from its rest position over the aperture 28.

As part of the angular displacement switch arrangement 18, disposedbeneath the concave surface 22 of the cuplike element 20 there isprovided a first lever arm 30 structure having an upwardly extending pin32 at one end 34 thereof. The pin 32 is in alignment with the aperture28 in the bottom of the cuplike element 20 and is adapted to movethrough the aperture 28 when the solid of revolution 24 is moved awayfrom its rest position over said aperture 28. At the other end 36 of thefirst lever arm 30, there is provided an electrical contact 38. Thefirst lever arm 30 is adapted to pivot about a shaft 40 from which thefirst lever arm 30 depends and is journaled thereto. A resilient member,such as a spring 42, is connected to the first lever arm 30 at a pointnear the one end 34 of the first lever arm 30 and near the upwardlyextending pin 32 and is adapted to urge the first lever arm 30 and pin32 to an upward position. When the ball 24 is moved from its seatedposition over the aperture 28 the pin 32' will move upwardly and throughthe aperture. In this manner, the pin 32 protrudes through the aperture28 and prevents the ball 24 from coming to rest thereover even if thecuplike element 20 moves to its normal upright position. Once the pin 32is in and through the aperture, the first lever arm 30 must be rotatedcounterclockwise (as shown by the arrow in FIG. 8 b about the axis ofrotation (the shaft 40), in order to remove the pin 32 from the aperture28 and permit the ball 24 to reset over the aperture. Under normalconditions the ball 24 is heavy enough to keep the upwardly urged pin 32from entering the aperture 28. As shown in FIG. 8, the normal positionis achieved when the ball 24 is seated over the aperture 28. FIG. 8ashows the ball removed from the aperture 28 and the pin 32 insertedtherein.

Another electrical contact point 44 is disposed beneath the other end 36of the first lever arm 30 and is adapted to engage the electricalcontact 38 positioned on the other end 36 of the first lever arm whenthe pin 32 has been rotated clockwise and is inserted in the aperture28, as shown in FIG. 8a. The electrical contact point 44 is connected bya conduit 46 to one side of the energy source or battery 16, as shown inFIG. 8. It may be seen, therefore, that when the pin 32 enters theaperture 28 the electrical contact 38 on the other end 36 of the firstlever arm 30 rotates downwardly, or clockwise, to make contact with theelectrical contact point 44 positioned therebelow.

The first lever arm 30 is electrically connected to the frame 12 orelectrical ground so that, when the contacts (38,44) make an electricalconnection a circuit is closed between the battery 16 and electricalground. As shown in FIG. 8, this will complete an electrical circuit tothe horn 14 such that the horn may be activated to emit a piercing alarmnoise. As previously indicated, the invention should not be consideredto be limited to the use of a horn mechanism for emitting a piercingnoise but may be adapted to activate lights or a radio transmitter forgiving an alarm signal at a remote point.

It will be recognized by those skilled in the art that once the alarm isgiven, unless the ball 24 is repositioned over the aperture, meaningthat the first leverarm 30 has been rotated counterclockwise so that thepin 32 no longer protrudes through the aperture 28, the electricalcontacts 38,44 are in electrical contact and the alarm remainsactivated.

In order to rotate the first lever arm 30 counterclockwise to turn offthe alarm sound, a second lever arm 48 is provided having a pivot point50 in approximately the center thereof. At the front end 52 of thesecond lever arm 48, there is provided an upwardly extending protrusion54 which is adapted to engage the first lever arm 30 at a point betweenthe axis of rotation 40 and the electrical contact 38 so that pressuremay be applied upwardly on the first lever arm 30 thereby rotatingcounterclockwise the one end 34 of the first leverarm 30 having theupwardly extending pin 32 connected thereto. In this manner by rotatingthe other end 36 ofthe first lever arm 30 in a counterclockwisedirection the pin 32 is disengaged from the aperture 28 therebypermitting the ball 24 to come to its rest position over the aperture 28when the machine to which the alarm unit is connected, is placed in itsnormal upright position. The rear end 56 of the second lever arm 48 isprovided with a downwardly curved section 58 which may be contacted by areset member 60, as will be more fully described.

In order to permit the disengagement of the pin 32 from the aperture 38of the cuplike element 20, a reset lock 62 is provided which, when usingthe proper security element, such as a key, may be turned so that thereset member60 may be rotated counterclockwise as seen in FIG. 2, byrotating the key 61, to contact the downwardly curved section 58 of thesecond lever arm 48 to rotate the front section 52 thereof intocontacting relationship with the first lever arm 30 to swing the pin 32counterclockwise disengaging the pin 32 from the aperture 28 andpermitting the ball 24 to reset over the aperture 28. This operation isclearly shown in FIGS. 3, 5 and 6. The reset lock 62 may take the formof a lock and key 61 which permits the turning of the reset member 60from a normal upward position counterclockwise, as shown by the arrow inFIG. 3, so that the reset member 60 engages the downwardly curvedsection 58 of the second lever arm 48 moving the same in acounterclockwise direction which will move the pin 32 from the aperture28, as previously described. As shown in FIGS. 3 and 7, a spring 64 maybe connected to the front end section 52 of the second lever arm 48 forholding the same in a normally downward position out of physical contactwith the other end 36 of the first lever arm 30. In this manner, it maybe seen that the turning of the reset member 60 works against the spring64 connected to the front end 52 of the second lever arm 48 so thatafter the resetting contact has been made between the second lever arm48 and first lever arm 30 and the reset member 60 is thereafter moved toits normal upright position bythe turning of the key 61, to move thereset member clockwise, the front end 52 of the second lever arm 48 isurged out of contact with the other end 36 of the first lever arm 30.

It should be noted that the springs 42, 64 may be adjusted to provide avarying of the stresses on the lever arms 30, 48 to which each spring isconnected; in this manner the sensitivity and movement of the lever arms30, 48 will be adjustable. For example, by slackening the tension on thespring 42 connected to the first lever arm 30, the pin 32 will not pushthe ball 24 from its seated position over the aperture 28 when the ball24 is moved only slightly. If the tension were greater the pin 32 mightmore forcefully urge the ball 24 away from its seated position afteronly a slight movement of the ball 24. The adjustable feature enhancesthe flexibility of the angular displacement switch 18 and permits agreater degree or lesser degree of sensitivity of the burglar alarm unit10 per se.

The frame 12 may be connected to the body of a portable machine, whichis to be protected, by means of a screw plate 66 integrally connected tothe back of the frame 12. Although the screw plate is shown as a meansof connection to the frame 12 to the unit to be protected, otherfastening means, not shown, may be provided which will permit a secureconnection between the alarm unit and the object to be protected. Itshould be particularly understood that a firm connection is the objectso that the alarm unit is not easily separable from the object to beprotected.

In operation, as shown iniFlG. 7, the tilting of the entire alarm unit10 causes the ball 24 to move off the aperture 28.

As soon as the aperture 28 has been cleared by the unseating of the ball24, the pin 32 is rotated into the aperture 28 by means of the firstlever arm 30. The other end 36 of the first lever arm 32 is rotateddownwardly thereby permitting the physical contact of the electricalcontacts 38 and 44 thereby electrically connecting the battery 16 to thehorn 14 resulting in the activation of the alarm. The ball 24 cannotreseat over the aperture 28 since the pin 32 prevents such reseating.The reset lock 62, having a reset member 60 may be rotated in acounterclockwise direction so that the reset member 60 urges the rearend 56 of the second lever arm in a clockwise direction thereby havingthe front end 52 of the second lever arm contacting the other end 36 ofthe first lever arm 30 for movement of the pin 32 in a counterclockwisedirection, out

of the aperture 28. The ball 24 may therefore reset over the aperture 28and the actions of the springs 42, 64 will hold the first lever arm 30and the second lever arm 48 in such position as to permit the ball 24 tobe maintained over the aperture 28 thereby disconnecting the electricalcontacts 38, 44 out of physical contact.

It should be noted that a front cover 68 fits over the frame 12 toenclose the total alarm unit. The front cover 68 is fastened to theframe in such a way as to be firmly positioned and only releasable fromthe frame when the reset lock is turned to unlock the cover 68 from theframe 12. In this manner, the reset lock 62 performs a twofold purpose:

1. to unlock the front cover 68 from the frame to permit access to theinterior of the frame 12 without setting off the alarm mechanism, and

2. to reset the alarm unit by disengaging the upwardly extending pin 32from the aperture 28 in the cuplike member 20.

Alternatively, as shown in FIGS. 9 and 10, the second lever arm 48 maybe completely eliminated from the structure, the alternative embodimentprovides an extension member 70 connected to the other end 36 of thefirst lever arm 30 which is adapted to be contacted by the reset member60 of the reset lock 62. The reset lock 62 is positioned toward theother end 36' of the first lever arm 30' such that when the key isturned in a clockwise movement the reset member 60' is turned clockwisetne reset member 60' an will lift the extension member 70 so as to pivotthe one end 34' of the first lever arm 30' counterclockwise therebybringing the pin 32 out of engagement ofthe aperture 28.

Structurally, the reset lock 62' is positioned close to the extensionmember 70 so that contact may be made by the reset member 60 when it isrotated clockwise. The resetting of the alarm unit results in thebreaking of the physical contact between the electrical contacts 38' and44 in the alternative embodiment. The function of the angulardisplacement switch is identical to the application that has beendescribed in detail with the preferred embodiment. It will be recognizedby those skilled in the art that the object of the present invention towit that a continuous alarm may be sounded by the tilting or suddenmovement of the alarm unit and the use of a angular displacementswitching arrangement for activating and continuously providing an alarmnoise. 1

While in accordance with the patent statutes a preferred embodiment andalternative embodiment has been shown and described in detail, it isparticularly understood that the invention is not limited thereto orthereby.

We claim:

1. A burglar alarm system comprising a frame, said frame beingconnectable to an object to be protected, a noise-making elementdisposed within said frame, a source of electrical energy mounted withinsaid frame, an angular displacement switch disposed between saidelectrical source of energy and said noise-making element for connectingsaid electrical source of energy to said noise-making element when theobject to be protected to which the frame is connected is either tilted,moved or jarred, said angular displacement switch having a solid ofrevolution movable from a rest position when said frame is tilted, movedor jarred, a first lever arm being spring actuated when said solid ofrevolution is moved from its rest position, said first lever armrotatably moving to close a pair of electrical contacts and preventingsaid solid of revolution from returning to its rest position, a frontcover releasably connected to said frame, and a reset lock disposed onsaid front cover and adapted to communicate with said first lever arm torotate the same permitting the solid of revolution to repose in its restposition thereby disengaging said noise-making element.

2. A burglar alarm system according to claim 1 wherein said angulardisplacement switch comprises a cuplike element, said cuplike elementhaving a concave bottom surface, an aperture disposed at the lowestpoint of said concave surface, said first lever arm being disposedadjacent said cuplike element, an upwardly extending pin positioned onone end of said first lever arm and adapted to cover the aperture in theconcave bottom surface of said cuplike element when said solid ofrevolution is unseated from over said aperture, said first lever armbeing provided with an electrical contact at the other end thereof, therotative motion of said first lever arm being controlled by the positionof said solid of revolution over said aperture in said cuplike element.

3. A burglar alarm system according to claim 2 wherein a second leverarm is rotatably engageable with said other end of said first lever armfor moving said first lever arm out of engagement with the aperture insaid cuplike element permitting the solid of revolution to reset oversaid aperture.

4. A burglar alarm system according to claim 3 wherein said second leverarm is rotatably moved by a contact with a reset member connected tosaid reset lock such that when said reset lock is rotated said resetmember rotates to move said second lever arm into contactingrelationship with said other end of said first leverarm.

5. A burglar alarm system according to claim 4 wherein said solid ofrevolution is movable from its seated position over said aperture whensaid frame is tilted or suddenly moved permitting the introduction ofsaid upwardly extending pin into said aperture by the movement of saidspring-biased first lever, said solid of revolution being unable toreseat for said aperture while said upwardly extending pin is engaged insaid aperture.

6. A burglar alarm system according to claim 5 wherein while said pin isengaged in said aperture said electrical contacts are in matingrelationship permitting said noise-making element to continuouslyprovide an alarm signal.

7. A burglar alarm system according to claim 6 wherein said reset lockis rotatable to permit the reseating of said solid of revolution oversaid aperture thereby disconnecting said noise-making element.

8. An alarm system according to claim 7 wherein said reset lock isadapted to unlock said front cover from said frame to permit the openingof said cover while said angular displacement switch is moved to thedeactivated position.

9. An alarm system according to claim 2 wherein said first lever arm isrotatably moved by a contact with reset member connected to said resetlock such that when said reset lock is rotated said reset member rotatesto move said other end of said first lever arm and said one end of saidfirst lever arm.

10. A burglar alarm system according to claim 9 wherein rotativemovement of said other end of said first lever arm moves said upwardlyextending pin out of engagement with said aperture in said cuplikeelement permitting the solid revolution to reseat over said aperture.

11. A burglar alarm system according to claim 10 wherein said resetmember is connected to said reset lock and is rotata ble when said resetlock is turned.

12. A burglar alarm system according to claim 11 wherein said reset lockis adapted to unlock said front cover from said frame to permit theopening of said cover while said angular displacement switch is moved tothe deactivated position thereby permitting access to the interior ofsaid frame.

13. A trundle switch comprising a cuplike element, said cuplike elementhaving vertical sidewalls and having a concave bottom surface, anaperture disposed at the bottom of said concave surface, an annulusadapted to freely move on said concave surface, said annulus having adeactivated position seated over said aperture, a first lever armdisposed beneath said cuplike element, said first lever arm having anupwardly extending pin in rotative alignment with said aperture, anelectrical contact disposed on the other end of said first lever arm,said first lever arm being spring activated to hold said upwardlyextending pin in said aperture, the weight of said annulus preventingsaid pin from protruding through said aperture, said upwardly extendingpin extending into and through said aperture when said annulus isunseated from over said aperture, said electrical contact being movableinto position when said upwardly extending pin is moved into and throughsaid aperture.

14. An angular displacement switch according to claim 13 wherein saidsolid of revolution is a steel ball.

said one end of said lever arm is rotated ina counterclockwise directionout of engagement with said aperture.

17. An angular displacement switch according to claim 16 wherein saidball cannot reseat over said aperture when said upwardly extending pinis extending through said aperture.

1. A burglar alarm system comprising a frame, said frame beingconnectable to an object to be protected, a noise-making elementdisposed within said frame, a source of electrical energy mounted withinsaid frame, an angular displacement switch disposed between saidelectrical source of energy and said noise-making element for connectingsaid electrical source of energy to said noise-making element when theobject to be protected to which the frame is connected is either tilted,moved or jarred, said angular displacement switch having a solid ofrevolution movable from a rest position when said frame is tilted, movedor jarred, a first lever arm being spring actuated when said solid ofrevolution is moved from its rest position, said first lever armrotatably moving to close a pair of electrical contacts and preventingsaid solid of revolution from returning to its rest position, a frontcover releasably connected to said frame, and a reset lock disposed onsaid front cover and adapted to communicate with said first lever arm torotate the same permitting the solid of revolution to repose in its restposition thereby disengaging said noise-making element.
 2. A burglaralarm system according to claim 1 wherein said angular displacementswitch comprises a cuplike element, said cuplike element having aconcave bottom surface, an aperture disposed at the lowest point of saidconcave surface, said first lever arm being disposed adjacent saidcuplike element, an upwardly extending pin positioned on one end of saidfirst lever arm and adapted to cover the aperture in the concave bottomsurface of said cuplike element when said solid of revolution isunseated from over said aperture, said first lever arm being providedwith an electrical contact at the other end thereof, the rotative motionof said first lever arm being controlled by the position of said solidof revolution over said aperture in said cuplike element.
 3. A burglaralarm system according to claim 2 wherein a second lever arm isrotatably engageable with said other end of said first lever arm formoving said first lever arm out of engagement with the aperture in saidcuplike element permitting the solid of revolution to reset over saidaperture.
 4. A burglar alarm system according to claim 3 wherein saidsecond lever arm is rotatably moved by a contact with a reset memberconnected to said reset lock such that when said reset lock is rotatedsaid reset member rotates to move said second lever arm into contactingrelationship with said other end of said first lever arm.
 5. A burglaralarm system according to claim 4 wherein said solid of revolution ismovable from its seated position over said aperturE when said frame istilted or suddenly moved permitting the introduction of said upwardlyextending pin into said aperture by the movement of said spring-biasedfirst lever, said solid of revolution being unable to reseat for saidaperture while said upwardly extending pin is engaged in said aperture.6. A burglar alarm system according to claim 5 wherein while said pin isengaged in said aperture said electrical contacts are in matingrelationship permitting said noise-making element to continuouslyprovide an alarm signal.
 7. A burglar alarm system according to claim 6wherein said reset lock is rotatable to permit the reseating of saidsolid of revolution over said aperture thereby disconnecting saidnoise-making element.
 8. An alarm system according to claim 7 whereinsaid reset lock is adapted to unlock said front cover from said frame topermit the opening of said cover while said angular displacement switchis moved to the deactivated position.
 9. An alarm system according toclaim 2 wherein said first lever arm is rotatably moved by a contactwith reset member connected to said reset lock such that when said resetlock is rotated said reset member rotates to move said other end of saidfirst lever arm and said one end of said first lever arm.
 10. A burglaralarm system according to claim 9 wherein rotative movement of saidother end of said first lever arm moves said upwardly extending pin outof engagement with said aperture in said cuplike element permitting thesolid revolution to reseat over said aperture.
 11. A burglar alarmsystem according to claim 10 wherein said reset member is connected tosaid reset lock and is rotatable when said reset lock is turned.
 12. Aburglar alarm system according to claim 11 wherein said reset lock isadapted to unlock said front cover from said frame to permit the openingof said cover while said angular displacement switch is moved to thedeactivated position thereby permitting access to the interior of saidframe.
 13. A trundle switch comprising a cuplike element, said cuplikeelement having vertical sidewalls and having a concave bottom surface,an aperture disposed at the bottom of said concave surface, an annulusadapted to freely move on said concave surface, said annulus having adeactivated position seated over said aperture, a first lever armdisposed beneath said cuplike element, said first lever arm having anupwardly extending pin in rotative alignment with said aperture, anelectrical contact disposed on the other end of said first lever arm,said first lever arm being spring activated to hold said upwardlyextending pin in said aperture, the weight of said annulus preventingsaid pin from protruding through said aperture, said upwardly extendingpin extending into and through said aperture when said annulus isunseated from over said aperture, said electrical contact being movableinto position when said upwardly extending pin is moved into and throughsaid aperture.
 14. An angular displacement switch according to claim 13wherein said solid of revolution is a steel ball.
 15. An angulardisplacement switch according to claim 14 wherein said aperture isdisposed through the lowest point of said concave surface.
 16. Anangular displacement switch according to claim 15 wherein said firstlever arm is rotatable about a fixed axis such that when said other endof said first lever arm is rotated in a counterclockwise direction saidupwardly extending pin on said one end of said lever arm is rotated in acounterclockwise direction out of engagement with said aperture.
 17. Anangular displacement switch according to claim 16 wherein said ballcannot reseat over said aperture when said upwardly extending pin isextending through said aperture.